Kenwood TS-570S
 

Am experiencing RF on the chassis of the radio when transmit. Have
good ground system, clean power supply, resonant antenna w/ low SWR.
When I touch the antenna of my RF Field Strength meter to any metal on
the radio, wattmeter or power supply it pins the needle. Opened
radio, looked at ant output connectors, could find no problems or bad
solder joints. Installed 1:1 choke balun on coax at radio, no effect
on problem. Hear myself talking in the headset and when transmitting
it triggers a motion detector light mounted outside and above the ham
shack. Same effect when using a dummy load. Defect inside the radio,
anyone experienced this?

73, Steve

Kenwood TS-570S
 

In article
,
wrote:

Am experiencing RF on the chassis of the radio when transmit. Have
good ground system, clean power supply, resonant antenna w/ low SWR.
When I touch the antenna of my RF Field Strength meter to any metal on
the radio, wattmeter or power supply it pins the needle. Opened
radio, looked at ant output connectors, could find no problems or bad
solder joints. Installed 1:1 choke balun on coax at radio, no effect
on problem. Hear myself talking in the headset and when transmitting
it triggers a motion detector light mounted outside and above the ham
shack. Same effect when using a dummy load. Defect inside the radio,
anyone experienced this?

73, Steve

and what makes you "Think" you have a "Good RF Ground"?????
Not likely....

Kenwood TS-570S
 

Kenwood TS-570S
 

wrote in message
...
Am experiencing RF on the chassis of the radio when transmit. Have
good ground system, clean power supply, resonant antenna w/ low SWR.
When I touch the antenna of my RF Field Strength meter to any metal on
the radio, wattmeter or power supply it pins the needle. Opened
radio, looked at ant output connectors, could find no problems or bad
solder joints. Installed 1:1 choke balun on coax at radio, no effect
on problem. Hear myself talking in the headset and when transmitting
it triggers a motion detector light mounted outside and above the ham
shack. Same effect when using a dummy load. Defect inside the radio,
anyone experienced this?

73, Steve

I don't believe your test is indicative of RF on the outside of your
feedline. Are you experiencing distortion on your SSB signal? Does the VSWR
change on your antenna system if you add in a length of coax? I think that
whatever you are touching your FSM to is simply acting like a longer
antenna. As for the motion detector- probably picking up RF directly from
the antenna- those things have no shielding or RF immunity.
Dale W4OP

Kenwood TS-570S
 

wrote in message
...
Am experiencing RF on the chassis of the radio when transmit. Have
good ground system, clean power supply, resonant antenna w/ low SWR.
When I touch the antenna of my RF Field Strength meter to any metal on
the radio, wattmeter or power supply it pins the needle. Opened
radio, looked at ant output connectors, could find no problems or bad
solder joints. Installed 1:1 choke balun on coax at radio, no effect
on problem. Hear myself talking in the headset and when transmitting
it triggers a motion detector light mounted outside and above the ham
shack. Same effect when using a dummy load. Defect inside the radio,
anyone experienced this?

73, Steve

Put the choke balun at the feed point.
Don't touch the FSM antenna to any metal. You might blow the diode.
Is there low swr on dummy load?
Is coax and dummy load double shielded?
Motion detector probably needs to be bypassed.
Check for ground faults in the house wiring.

What kind of antenna? Describe 'good ground'

Kenwood TS-570S
 

On Sep 9, 7:27*pm, "Dale Parfitt" wrote:
wrote in message

...

Am experiencing RF on the chassis of the radio when transmit. *Have
good ground system, clean power supply, resonant antenna w/ low SWR.
When I touch the antenna of my RF Field Strength meter to any metal on
the radio, wattmeter or power supply it pins the needle. *Opened
radio, looked at ant output connectors, could find no problems or bad
solder joints. *Installed 1:1 choke balun on coax at radio, no effect
on problem. *Hear myself talking in the headset and when transmitting
it triggers a motion detector light mounted outside and above the ham
shack. *Same effect when using a dummy load. *Defect inside the radio,
anyone experienced this?

73, Steve

I don't believe your test is indicative of RF on the outside of your
feedline. Are you experiencing distortion on your SSB signal? Does the VSWR
change on your antenna system if you add in a length of coax? I think that
whatever you are touching your FSM to is simply acting like a longer
antenna. As for the motion detector- probably picking up RF directly from
the antenna- those things have no shielding or RF immunity.
Dale W4OP

If the transmitter is feeding RF via a shielded coax,into a shielded
50 ohm dummy load,and VSWR is low, I don`t think you have a problem..
Field strength as measured by portable meter, short antenna ,tuned
circuit,diode det. analog 50ua. meter ..I would expect to see RF all
over the shack..All this may be normal.. Harold W4PQW

Kenwood TS-570S
 

In article
,
wrote:

Hear myself talking in the headset and when transmitting
it triggers a motion detector light mounted outside and above the ham
shack. Same effect when using a dummy load. Defect inside the radio,
anyone experienced this?

Steve-

I suspect you have a cable with an open or resistive shield connection.
If so, it would be a cable that is common to both your antenna and the
dummy load.

Do you have one of the dummy loads that screws directly onto the SO-239
connector on the rig? Radio Shack used to sell one that was good for 10
or 15 Watts, but would withstand 100 Watts for a few seconds. If the
problem with the motion detector is present with such a
directly-connected dummy load, then look inside the rig. If not, then
look outside.

Fred
K4DII

Kenwood TS-570S
 

On Sep 9, 9:15*am, wrote:
Am experiencing RF on the chassis of the radio when transmit. *Have
good ground system, clean power supply, resonant antenna w/ low SWR.
When I touch the antenna of my RF Field Strength meter to any metal on
the radio, wattmeter or power supply it pins the needle. *Opened
radio, looked at ant output connectors, could find no problems or bad
solder joints. *Installed 1:1 choke balun on coax at radio, no effect
on problem. *Hear myself talking in the headset and when transmitting
it triggers a motion detector light mounted outside and above the ham
shack. *Same effect when using a dummy load. *Defect inside the radio,
anyone experienced this?

73, Steve

Thanks to everyone who responded. The problem of hearing myself when
transmitting is a problem in the radio as I suspected. The motion
light issue is of no concern, they are inherently prone to RF setting
them off. This one is only about 5' above the radio on the outside
wall. My main question was directed to if anyone had this type
problem with their TS-570.

73, Steve

Kenwood TS-570S
 

Kenwood TS-570S
 

One of the functions that you can enable with this unit is a Tx audio
moniter. Check out your manual. There is nothing wrong with the radio. Read
the manual.

Pete

wrote in message
...
On Sep 9, 9:15 am, wrote:
Am experiencing RF on the chassis of the radio when transmit. Have
good ground system, clean power supply, resonant antenna w/ low SWR.
When I touch the antenna of my RF Field Strength meter to any metal on
the radio, wattmeter or power supply it pins the needle. Opened
radio, looked at ant output connectors, could find no problems or bad
solder joints. Installed 1:1 choke balun on coax at radio, no effect
on problem. Hear myself talking in the headset and when transmitting
it triggers a motion detector light mounted outside and above the ham
shack. Same effect when using a dummy load. Defect inside the radio,
anyone experienced this?

73, Steve

Thanks to everyone who responded. The problem of hearing myself when
transmitting is a problem in the radio as I suspected. The motion
light issue is of no concern, they are inherently prone to RF setting
them off. This one is only about 5' above the radio on the outside
wall. My main question was directed to if anyone had this type
problem with their TS-570.

73, Steve